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    <li><a href="../../ActionController/HttpAuthentication/Basic/ControllerMethods.html">ActionController::HttpAuthentication::Basic::ControllerMethods</a>
  
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    <li><a href="../../ActionController/Renderers/All.html">ActionController::Renderers::All</a>
  
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    <li><a href="../../ActionController/Rendering.html">ActionController::Rendering</a>
  
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    <li><a href="../../ActionView/ActionView.html">ActionView::ActionView</a>
  
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    <li><a href="../../ActionView/Helpers/AssetTagHelper/JavascriptTagHelpers/ClassMethods.html">ActionView::Helpers::AssetTagHelper::JavascriptTagHelpers::ClassMethods</a>
  
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    <li><a href="../../ActiveModel/AttributeMethods.html">ActiveModel::AttributeMethods</a>
  
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<div id="documentation">
  <h1 class="class">class ActiveSupport::Cache::Store</h1>

  <div id="description" class="description">
    
<p>An abstract cache store class. There are multiple cache store
implementations, each having its own additional features. See the classes
under the <a href="../Cache.html">ActiveSupport::Cache</a> module, e.g. <a
href="MemCacheStore.html">ActiveSupport::Cache::MemCacheStore</a>. <a
href="MemCacheStore.html">MemCacheStore</a> is currently the most popular
cache store for large production websites.</p>

<p>Some implementations may not support all methods beyond the basic cache
methods of <code>fetch</code>, <code>write</code>, <code>read</code>,
<code>exist?</code>, and <code>delete</code>.</p>

<p><a href="Store.html">ActiveSupport::Cache::Store</a> can store any
serializable Ruby object.</p>

<pre class="ruby"><span class="ruby-identifier">cache</span> = <span class="ruby-constant">ActiveSupport</span><span class="ruby-operator">::</span><span class="ruby-constant">Cache</span><span class="ruby-operator">::</span><span class="ruby-constant">MemoryStore</span>.<span class="ruby-identifier">new</span>

<span class="ruby-identifier">cache</span>.<span class="ruby-identifier">read</span>(<span class="ruby-string">&quot;city&quot;</span>)   <span class="ruby-comment"># =&gt; nil</span>
<span class="ruby-identifier">cache</span>.<span class="ruby-identifier">write</span>(<span class="ruby-string">&quot;city&quot;</span>, <span class="ruby-string">&quot;Duckburgh&quot;</span>)
<span class="ruby-identifier">cache</span>.<span class="ruby-identifier">read</span>(<span class="ruby-string">&quot;city&quot;</span>)   <span class="ruby-comment"># =&gt; &quot;Duckburgh&quot;</span>
</pre>

<p>Keys are always translated into Strings and are case sensitive. When an
object is specified as a key and has a <code>cache_key</code> method
defined, this method will be called to define the key.  Otherwise, the
<code>to_param</code> method will be called. Hashes and Arrays can also be
used as keys. The elements will be delimited by slashes, and the elements
within a <a href="../../Hash.html">Hash</a> will be sorted by key so they
are consistent.</p>

<pre class="ruby"><span class="ruby-identifier">cache</span>.<span class="ruby-identifier">read</span>(<span class="ruby-string">&quot;city&quot;</span>) <span class="ruby-operator">==</span> <span class="ruby-identifier">cache</span>.<span class="ruby-identifier">read</span>(:<span class="ruby-identifier">city</span>)   <span class="ruby-comment"># =&gt; true</span>
</pre>

<p>Nil values can be cached.</p>

<p>If your cache is on a shared infrastructure, you can define a namespace for
your cache entries. If a namespace is defined, it will be prefixed on to
every key. The namespace can be either a static value or a Proc. If it is a
Proc, it will be invoked when each key is evaluated so that you can use
application logic to invalidate keys.</p>

<pre>cache.namespace = lambda { @last_mod_time }  # Set the namespace to a variable
@last_mod_time = Time.now  # Invalidate the entire cache by changing namespace</pre>

<p>Caches can also store values in a compressed format to save space and
reduce time spent sending data. Since there is overhead, values must be
large enough to warrant compression. To turn on compression either pass
<code>:compress =&gt; true</code> in the initializer or as an option to
<code>fetch</code> or <code>write</code>. To specify the threshold at which
to compress values, set the <code>:compress_threshold</code> option. The
default threshold is 16K.</p>

  </div><!-- description -->

  
  
  
  <section id="5Buntitled-5D" class="documentation-section">
    

    

    

    
    <!-- Attributes -->
    <section id="attribute-method-details" class="method-section section">
      <h3 class="section-header">Attributes</h3>

      
      <div id="attribute-i-options" class="method-detail">
        <div class="method-heading attribute-method-heading">
          <span class="method-name">options</span><span
            class="attribute-access-type">[R]</span>
        </div>

        <div class="method-description">
        
        
        
        </div>
      </div>
      
      <div id="attribute-i-silence" class="method-detail">
        <div class="method-heading attribute-method-heading">
          <span class="method-name">silence</span><span
            class="attribute-access-type">[R]</span>
        </div>

        <div class="method-description">
        
        
        
        </div>
      </div>
      
      <div id="attribute-i-silence-3F" class="method-detail">
        <div class="method-heading attribute-method-heading">
          <span class="method-name">silence?</span><span
            class="attribute-access-type">[R]</span>
        </div>

        <div class="method-description">
        
        
        
        </div>
      </div>
      
    </section><!-- attribute-method-details -->
    

    <!-- Methods -->
    
     <section id="public-class-5Buntitled-5D-method-details" class="method-section section">
      <h3 class="section-header">Public Class Methods</h3>

    
      <div id="method-c-instrument" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">instrument</span><span
            class="method-args">()</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          
          

          
          <div class="method-source-code" id="instrument-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.7/lib/active_support/cache.rb, line 175</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier">instrument</span>
  <span class="ruby-constant">Thread</span>.<span class="ruby-identifier">current</span>[<span class="ruby-value">:instrument_cache_store</span>] <span class="ruby-operator">||</span> <span class="ruby-keyword">false</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- instrument-source -->
          
        </div>

        

        
      </div><!-- instrument-method -->

    
      <div id="method-c-instrument-3D" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">instrument=</span><span
            class="method-args">(boolean)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Set to true if cache stores should be instrumented. Default is false.</p>
          

          
          <div class="method-source-code" id="instrument-3D-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.7/lib/active_support/cache.rb, line 171</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier">instrument=</span>(<span class="ruby-identifier">boolean</span>)
  <span class="ruby-constant">Thread</span>.<span class="ruby-identifier">current</span>[<span class="ruby-value">:instrument_cache_store</span>] = <span class="ruby-identifier">boolean</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- instrument-3D-source -->
          
        </div>

        

        
      </div><!-- instrument-3D-method -->

    
      <div id="method-c-new" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">new</span><span
            class="method-args">(options = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Create a new cache. The options will be passed to any write method calls
except for :namespace which can be used to set the global namespace for the
cache.</p>
          

          
          <div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.7/lib/active_support/cache.rb, line 152</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">initialize</span>(<span class="ruby-identifier">options</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-ivar">@options</span> = <span class="ruby-identifier">options</span> <span class="ruby-operator">?</span> <span class="ruby-identifier">options</span>.<span class="ruby-identifier">dup</span> <span class="ruby-operator">:</span> {}
<span class="ruby-keyword">end</span></pre>
          </div><!-- new-source -->
          
        </div>

        

        
      </div><!-- new-method -->

    
    </section><!-- public-class-method-details -->
  
     <section id="public-instance-5Buntitled-5D-method-details" class="method-section section">
      <h3 class="section-header">Public Instance Methods</h3>

    
      <div id="method-i-cleanup" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">cleanup</span><span
            class="method-args">(options = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Cleanup the cache by removing expired entries.</p>

<p>Options are passed to the underlying cache implementation.</p>

<p>All implementations may not support this method.</p>
          

          
          <div class="method-source-code" id="cleanup-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.7/lib/active_support/cache.rb, line 425</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">cleanup</span>(<span class="ruby-identifier">options</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-identifier">raise</span> <span class="ruby-constant">NotImplementedError</span>.<span class="ruby-identifier">new</span>(<span class="ruby-node">&quot;#{self.class.name} does not support cleanup&quot;</span>)
<span class="ruby-keyword">end</span></pre>
          </div><!-- cleanup-source -->
          
        </div>

        

        
      </div><!-- cleanup-method -->

    
      <div id="method-i-clear" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">clear</span><span
            class="method-args">(options = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Clear the entire cache. Be careful with this method since it could affect
other processes if shared cache is being used.</p>

<p>Options are passed to the underlying cache implementation.</p>

<p>All implementations may not support this method.</p>
          

          
          <div class="method-source-code" id="clear-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.7/lib/active_support/cache.rb, line 435</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">clear</span>(<span class="ruby-identifier">options</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-identifier">raise</span> <span class="ruby-constant">NotImplementedError</span>.<span class="ruby-identifier">new</span>(<span class="ruby-node">&quot;#{self.class.name} does not support clear&quot;</span>)
<span class="ruby-keyword">end</span></pre>
          </div><!-- clear-source -->
          
        </div>

        

        
      </div><!-- clear-method -->

    
      <div id="method-i-decrement" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">decrement</span><span
            class="method-args">(name, amount = 1, options = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Increment an integer value in the cache.</p>

<p>Options are passed to the underlying cache implementation.</p>

<p>All implementations may not support this method.</p>
          

          
          <div class="method-source-code" id="decrement-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.7/lib/active_support/cache.rb, line 416</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">decrement</span>(<span class="ruby-identifier">name</span>, <span class="ruby-identifier">amount</span> = <span class="ruby-value">1</span>, <span class="ruby-identifier">options</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-identifier">raise</span> <span class="ruby-constant">NotImplementedError</span>.<span class="ruby-identifier">new</span>(<span class="ruby-node">&quot;#{self.class.name} does not support decrement&quot;</span>)
<span class="ruby-keyword">end</span></pre>
          </div><!-- decrement-source -->
          
        </div>

        

        
      </div><!-- decrement-method -->

    
      <div id="method-i-delete" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">delete</span><span
            class="method-args">(name, options = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Deletes an entry in the cache. Returns <code>true</code> if an entry is
deleted.</p>

<p>Options are passed to the underlying cache implementation.</p>
          

          
          <div class="method-source-code" id="delete-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.7/lib/active_support/cache.rb, line 371</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">delete</span>(<span class="ruby-identifier">name</span>, <span class="ruby-identifier">options</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-identifier">options</span> = <span class="ruby-identifier">merged_options</span>(<span class="ruby-identifier">options</span>)
  <span class="ruby-identifier">instrument</span>(<span class="ruby-value">:delete</span>, <span class="ruby-identifier">name</span>) <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">payload</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">delete_entry</span>(<span class="ruby-identifier">namespaced_key</span>(<span class="ruby-identifier">name</span>, <span class="ruby-identifier">options</span>), <span class="ruby-identifier">options</span>)
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- delete-source -->
          
        </div>

        

        
      </div><!-- delete-method -->

    
      <div id="method-i-delete_matched" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">delete_matched</span><span
            class="method-args">(matcher, options = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Delete all entries with keys matching the pattern.</p>

<p>Options are passed to the underlying cache implementation.</p>

<p>All implementations may not support this method.</p>
          

          
          <div class="method-source-code" id="delete_matched-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.7/lib/active_support/cache.rb, line 398</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">delete_matched</span>(<span class="ruby-identifier">matcher</span>, <span class="ruby-identifier">options</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-identifier">raise</span> <span class="ruby-constant">NotImplementedError</span>.<span class="ruby-identifier">new</span>(<span class="ruby-node">&quot;#{self.class.name} does not support delete_matched&quot;</span>)
<span class="ruby-keyword">end</span></pre>
          </div><!-- delete_matched-source -->
          
        </div>

        

        
      </div><!-- delete_matched-method -->

    
      <div id="method-i-exist-3F" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">exist?</span><span
            class="method-args">(name, options = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Return true if the cache contains an entry for the given key.</p>

<p>Options are passed to the underlying cache implementation.</p>
          

          
          <div class="method-source-code" id="exist-3F-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.7/lib/active_support/cache.rb, line 381</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">exist?</span>(<span class="ruby-identifier">name</span>, <span class="ruby-identifier">options</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-identifier">options</span> = <span class="ruby-identifier">merged_options</span>(<span class="ruby-identifier">options</span>)
  <span class="ruby-identifier">instrument</span>(<span class="ruby-value">:exist?</span>, <span class="ruby-identifier">name</span>) <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">payload</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">entry</span> = <span class="ruby-identifier">read_entry</span>(<span class="ruby-identifier">namespaced_key</span>(<span class="ruby-identifier">name</span>, <span class="ruby-identifier">options</span>), <span class="ruby-identifier">options</span>)
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">entry</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-operator">!</span><span class="ruby-identifier">entry</span>.<span class="ruby-identifier">expired?</span>
      <span class="ruby-keyword">true</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-keyword">false</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- exist-3F-source -->
          
        </div>

        

        
      </div><!-- exist-3F-method -->

    
      <div id="method-i-fetch" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">fetch</span><span
            class="method-args">(name, options = nil) { || ... }</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Fetches data from the cache, using the given key. If there is data in the
cache with the given key, then that data is returned.</p>

<p>If there is no such data in the cache (a cache miss), then nil will be
returned. However, if a block has been passed, that block will be run in
the event of a cache miss. The return value of the block will be written to
the cache under the given cache key, and that return value will be
returned.</p>

<pre class="ruby"><span class="ruby-identifier">cache</span>.<span class="ruby-identifier">write</span>(<span class="ruby-string">&quot;today&quot;</span>, <span class="ruby-string">&quot;Monday&quot;</span>)
<span class="ruby-identifier">cache</span>.<span class="ruby-identifier">fetch</span>(<span class="ruby-string">&quot;today&quot;</span>)  <span class="ruby-comment"># =&gt; &quot;Monday&quot;</span>

<span class="ruby-identifier">cache</span>.<span class="ruby-identifier">fetch</span>(<span class="ruby-string">&quot;city&quot;</span>)   <span class="ruby-comment"># =&gt; nil</span>
<span class="ruby-identifier">cache</span>.<span class="ruby-identifier">fetch</span>(<span class="ruby-string">&quot;city&quot;</span>) <span class="ruby-keyword">do</span>
  <span class="ruby-string">&quot;Duckburgh&quot;</span>
<span class="ruby-keyword">end</span>
<span class="ruby-identifier">cache</span>.<span class="ruby-identifier">fetch</span>(<span class="ruby-string">&quot;city&quot;</span>)   <span class="ruby-comment"># =&gt; &quot;Duckburgh&quot;</span>
</pre>

<p>You may also specify additional options via the <code>options</code>
argument. Setting <code>:force =&gt; true</code> will force a cache miss:</p>

<pre class="ruby"><span class="ruby-identifier">cache</span>.<span class="ruby-identifier">write</span>(<span class="ruby-string">&quot;today&quot;</span>, <span class="ruby-string">&quot;Monday&quot;</span>)
<span class="ruby-identifier">cache</span>.<span class="ruby-identifier">fetch</span>(<span class="ruby-string">&quot;today&quot;</span>, :<span class="ruby-identifier">force</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>)  <span class="ruby-comment"># =&gt; nil</span>
</pre>

<p>Setting <code>:compress</code> will store a large cache entry set by the
call in a compressed format.</p>

<p>Setting <code>:expires_in</code> will set an expiration time on the cache.
All caches support auto-expiring content after a specified number of
seconds. This value can be specified as an option to the constructor (in
which case all entries will be affected), or it can be supplied to the
<code>fetch</code> or <code>write</code> method to effect just one entry.</p>

<pre class="ruby"><span class="ruby-identifier">cache</span> = <span class="ruby-constant">ActiveSupport</span><span class="ruby-operator">::</span><span class="ruby-constant">Cache</span><span class="ruby-operator">::</span><span class="ruby-constant">MemoryStore</span>.<span class="ruby-identifier">new</span>(:<span class="ruby-identifier">expires_in</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">5</span>.<span class="ruby-identifier">minutes</span>)
<span class="ruby-identifier">cache</span>.<span class="ruby-identifier">write</span>(<span class="ruby-identifier">key</span>, <span class="ruby-identifier">value</span>, :<span class="ruby-identifier">expires_in</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">1</span>.<span class="ruby-identifier">minute</span>)  <span class="ruby-comment"># Set a lower value for one entry</span>
</pre>

<p>Setting <code>:race_condition_ttl</code> is very useful in situations where
a cache entry is used very frequently and is under heavy load. If a cache
expires and due to heavy load seven different processes will try to read
data natively and then they all will try to write to cache. To avoid that
case the first process to find an expired cache entry will bump the cache
expiration time by the value set in <code>:race_condition_ttl</code>. Yes
this process is extending the time for a stale value by another few
seconds. Because of extended life of the previous cache, other processes
will continue to use slightly stale data for a just a big longer. In the
meantime that first process will go ahead and will write into cache the new
value. After that all the processes will start getting new value. The key
is to keep <code>:race_condition_ttl</code> small.</p>

<p>If the process regenerating the entry errors out, the entry will be
regenerated after the specified number of seconds. Also note that the life
of stale cache is extended only if it expired recently. Otherwise a new
value is generated and <code>:race_condition_ttl</code> does not play any
role.</p>

<pre class="ruby"><span class="ruby-comment"># Set all values to expire after one minute.</span>
<span class="ruby-identifier">cache</span> = <span class="ruby-constant">ActiveSupport</span><span class="ruby-operator">::</span><span class="ruby-constant">Cache</span><span class="ruby-operator">::</span><span class="ruby-constant">MemoryStore</span>.<span class="ruby-identifier">new</span>(:<span class="ruby-identifier">expires_in</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">1</span>.<span class="ruby-identifier">minute</span>)

<span class="ruby-identifier">cache</span>.<span class="ruby-identifier">write</span>(<span class="ruby-string">&quot;foo&quot;</span>, <span class="ruby-string">&quot;original value&quot;</span>)
<span class="ruby-identifier">val_1</span> = <span class="ruby-keyword">nil</span>
<span class="ruby-identifier">val_2</span> = <span class="ruby-keyword">nil</span>
<span class="ruby-identifier">sleep</span> <span class="ruby-value">60</span>

<span class="ruby-constant">Thread</span>.<span class="ruby-identifier">new</span> <span class="ruby-keyword">do</span>
  <span class="ruby-identifier">val_1</span> = <span class="ruby-identifier">cache</span>.<span class="ruby-identifier">fetch</span>(<span class="ruby-string">&quot;foo&quot;</span>, :<span class="ruby-identifier">race_condition_ttl</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">10</span>) <span class="ruby-keyword">do</span>
    <span class="ruby-identifier">sleep</span> <span class="ruby-value">1</span>
    <span class="ruby-string">&quot;new value 1&quot;</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>

<span class="ruby-constant">Thread</span>.<span class="ruby-identifier">new</span> <span class="ruby-keyword">do</span>
  <span class="ruby-identifier">val_2</span> = <span class="ruby-identifier">cache</span>.<span class="ruby-identifier">fetch</span>(<span class="ruby-string">&quot;foo&quot;</span>, :<span class="ruby-identifier">race_condition_ttl</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">10</span>) <span class="ruby-keyword">do</span>
    <span class="ruby-string">&quot;new value 2&quot;</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>

<span class="ruby-comment"># val_1 =&gt; &quot;new value 1&quot;</span>
<span class="ruby-comment"># val_2 =&gt; &quot;original value&quot;</span>
<span class="ruby-comment"># sleep 10 # First thread extend the life of cache by another 10 seconds</span>
<span class="ruby-comment"># cache.fetch(&quot;foo&quot;) =&gt; &quot;new value 1&quot;</span>
</pre>

<p>Other options will be handled by the specific cache store implementation.
Internally, <a href="Store.html#method-i-fetch">fetch</a> calls read_entry,
and calls write_entry on a cache miss. <code>options</code> will be passed
to the <a href="Store.html#method-i-read">read</a> and <a
href="Store.html#method-i-write">write</a> calls.</p>

<p>For example, MemCacheStore’s <a href="Store.html#method-i-write">write</a>
method supports the <code>:raw</code> option, which tells the memcached
server to store all values as strings. We can use this option with <a
href="Store.html#method-i-fetch">fetch</a> too:</p>

<pre class="ruby"><span class="ruby-identifier">cache</span> = <span class="ruby-constant">ActiveSupport</span><span class="ruby-operator">::</span><span class="ruby-constant">Cache</span><span class="ruby-operator">::</span><span class="ruby-constant">MemCacheStore</span>.<span class="ruby-identifier">new</span>
<span class="ruby-identifier">cache</span>.<span class="ruby-identifier">fetch</span>(<span class="ruby-string">&quot;foo&quot;</span>, :<span class="ruby-identifier">force</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>, :<span class="ruby-identifier">raw</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>) <span class="ruby-keyword">do</span>
  :<span class="ruby-identifier">bar</span>
<span class="ruby-keyword">end</span>
<span class="ruby-identifier">cache</span>.<span class="ruby-identifier">fetch</span>(<span class="ruby-string">&quot;foo&quot;</span>)  <span class="ruby-comment"># =&gt; &quot;bar&quot;</span>
</pre>
          

          
          <div class="method-source-code" id="fetch-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.7/lib/active_support/cache.rb, line 271</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">fetch</span>(<span class="ruby-identifier">name</span>, <span class="ruby-identifier">options</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">block_given?</span>
    <span class="ruby-identifier">options</span> = <span class="ruby-identifier">merged_options</span>(<span class="ruby-identifier">options</span>)
    <span class="ruby-identifier">key</span> = <span class="ruby-identifier">namespaced_key</span>(<span class="ruby-identifier">name</span>, <span class="ruby-identifier">options</span>)
    <span class="ruby-keyword">unless</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:force</span>]
      <span class="ruby-identifier">entry</span> = <span class="ruby-identifier">instrument</span>(<span class="ruby-value">:read</span>, <span class="ruby-identifier">name</span>, <span class="ruby-identifier">options</span>) <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">payload</span><span class="ruby-operator">|</span>
        <span class="ruby-identifier">payload</span>[<span class="ruby-value">:super_operation</span>] = <span class="ruby-value">:fetch</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">payload</span>
        <span class="ruby-identifier">read_entry</span>(<span class="ruby-identifier">key</span>, <span class="ruby-identifier">options</span>)
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">entry</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">entry</span>.<span class="ruby-identifier">expired?</span>
      <span class="ruby-identifier">race_ttl</span> = <span class="ruby-identifier">options</span>[<span class="ruby-value">:race_condition_ttl</span>].<span class="ruby-identifier">to_f</span>
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">race_ttl</span> <span class="ruby-keyword">and</span> <span class="ruby-constant">Time</span>.<span class="ruby-identifier">now</span>.<span class="ruby-identifier">to_f</span> <span class="ruby-operator">-</span> <span class="ruby-identifier">entry</span>.<span class="ruby-identifier">expires_at</span> <span class="ruby-operator">&lt;=</span> <span class="ruby-identifier">race_ttl</span>
        <span class="ruby-identifier">entry</span>.<span class="ruby-identifier">expires_at</span> = <span class="ruby-constant">Time</span>.<span class="ruby-identifier">now</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">race_ttl</span>
        <span class="ruby-identifier">write_entry</span>(<span class="ruby-identifier">key</span>, <span class="ruby-identifier">entry</span>, <span class="ruby-value">:expires_in</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">race_ttl</span> * <span class="ruby-value">2</span>)
      <span class="ruby-keyword">else</span>
        <span class="ruby-identifier">delete_entry</span>(<span class="ruby-identifier">key</span>, <span class="ruby-identifier">options</span>)
      <span class="ruby-keyword">end</span>
      <span class="ruby-identifier">entry</span> = <span class="ruby-keyword">nil</span>
    <span class="ruby-keyword">end</span>

    <span class="ruby-keyword">if</span> <span class="ruby-identifier">entry</span>
      <span class="ruby-identifier">instrument</span>(<span class="ruby-value">:fetch_hit</span>, <span class="ruby-identifier">name</span>, <span class="ruby-identifier">options</span>) { <span class="ruby-operator">|</span><span class="ruby-identifier">payload</span><span class="ruby-operator">|</span> }
      <span class="ruby-identifier">entry</span>.<span class="ruby-identifier">value</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">result</span> = <span class="ruby-identifier">instrument</span>(<span class="ruby-value">:generate</span>, <span class="ruby-identifier">name</span>, <span class="ruby-identifier">options</span>) <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">payload</span><span class="ruby-operator">|</span>
        <span class="ruby-keyword">yield</span>
      <span class="ruby-keyword">end</span>
      <span class="ruby-identifier">write</span>(<span class="ruby-identifier">name</span>, <span class="ruby-identifier">result</span>, <span class="ruby-identifier">options</span>)
      <span class="ruby-identifier">result</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">read</span>(<span class="ruby-identifier">name</span>, <span class="ruby-identifier">options</span>)
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- fetch-source -->
          
        </div>

        

        
      </div><!-- fetch-method -->

    
      <div id="method-i-increment" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">increment</span><span
            class="method-args">(name, amount = 1, options = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Increment an integer value in the cache.</p>

<p>Options are passed to the underlying cache implementation.</p>

<p>All implementations may not support this method.</p>
          

          
          <div class="method-source-code" id="increment-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.7/lib/active_support/cache.rb, line 407</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">increment</span>(<span class="ruby-identifier">name</span>, <span class="ruby-identifier">amount</span> = <span class="ruby-value">1</span>, <span class="ruby-identifier">options</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-identifier">raise</span> <span class="ruby-constant">NotImplementedError</span>.<span class="ruby-identifier">new</span>(<span class="ruby-node">&quot;#{self.class.name} does not support increment&quot;</span>)
<span class="ruby-keyword">end</span></pre>
          </div><!-- increment-source -->
          
        </div>

        

        
      </div><!-- increment-method -->

    
      <div id="method-i-mute" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">mute</span><span
            class="method-args">() { || ... }</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Silence the logger within a block.</p>
          

          
          <div class="method-source-code" id="mute-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.7/lib/active_support/cache.rb, line 163</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">mute</span>
  <span class="ruby-identifier">previous_silence</span>, <span class="ruby-ivar">@silence</span> = <span class="ruby-keyword">defined?</span>(<span class="ruby-ivar">@silence</span>) <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-ivar">@silence</span>, <span class="ruby-keyword">true</span>
  <span class="ruby-keyword">yield</span>
<span class="ruby-keyword">ensure</span>
  <span class="ruby-ivar">@silence</span> = <span class="ruby-identifier">previous_silence</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- mute-source -->
          
        </div>

        

        
      </div><!-- mute-method -->

    
      <div id="method-i-read" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">read</span><span
            class="method-args">(name, options = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Fetches data from the cache, using the given key. If there is data in the
cache with the given key, then that data is returned. Otherwise, nil is
returned.</p>

<p>Options are passed to the underlying cache implementation.</p>
          

          
          <div class="method-source-code" id="read-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.7/lib/active_support/cache.rb, line 312</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">read</span>(<span class="ruby-identifier">name</span>, <span class="ruby-identifier">options</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-identifier">options</span> = <span class="ruby-identifier">merged_options</span>(<span class="ruby-identifier">options</span>)
  <span class="ruby-identifier">key</span> = <span class="ruby-identifier">namespaced_key</span>(<span class="ruby-identifier">name</span>, <span class="ruby-identifier">options</span>)
  <span class="ruby-identifier">instrument</span>(<span class="ruby-value">:read</span>, <span class="ruby-identifier">name</span>, <span class="ruby-identifier">options</span>) <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">payload</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">entry</span> = <span class="ruby-identifier">read_entry</span>(<span class="ruby-identifier">key</span>, <span class="ruby-identifier">options</span>)
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">entry</span>
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">entry</span>.<span class="ruby-identifier">expired?</span>
        <span class="ruby-identifier">delete_entry</span>(<span class="ruby-identifier">key</span>, <span class="ruby-identifier">options</span>)
        <span class="ruby-identifier">payload</span>[<span class="ruby-value">:hit</span>] = <span class="ruby-keyword">false</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">payload</span>
        <span class="ruby-keyword">nil</span>
      <span class="ruby-keyword">else</span>
        <span class="ruby-identifier">payload</span>[<span class="ruby-value">:hit</span>] = <span class="ruby-keyword">true</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">payload</span>
        <span class="ruby-identifier">entry</span>.<span class="ruby-identifier">value</span>
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">payload</span>[<span class="ruby-value">:hit</span>] = <span class="ruby-keyword">false</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">payload</span>
      <span class="ruby-keyword">nil</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- read-source -->
          
        </div>

        

        
      </div><!-- read-method -->

    
      <div id="method-i-read_multi" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">read_multi</span><span
            class="method-args">(*names)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Read multiple values at once from the cache. Options can be passed in the
last argument.</p>

<p>Some cache implementation may optimize this method.</p>

<p>Returns a hash mapping the names provided to the values found.</p>
          

          
          <div class="method-source-code" id="read_multi-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.7/lib/active_support/cache.rb, line 339</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">read_multi</span>(*<span class="ruby-identifier">names</span>)
  <span class="ruby-identifier">options</span> = <span class="ruby-identifier">names</span>.<span class="ruby-identifier">extract_options!</span>
  <span class="ruby-identifier">options</span> = <span class="ruby-identifier">merged_options</span>(<span class="ruby-identifier">options</span>)
  <span class="ruby-identifier">results</span> = {}
  <span class="ruby-identifier">names</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">name</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">key</span> = <span class="ruby-identifier">namespaced_key</span>(<span class="ruby-identifier">name</span>, <span class="ruby-identifier">options</span>)
    <span class="ruby-identifier">entry</span> = <span class="ruby-identifier">read_entry</span>(<span class="ruby-identifier">key</span>, <span class="ruby-identifier">options</span>)
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">entry</span>
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">entry</span>.<span class="ruby-identifier">expired?</span>
        <span class="ruby-identifier">delete_entry</span>(<span class="ruby-identifier">key</span>, <span class="ruby-identifier">options</span>)
      <span class="ruby-keyword">else</span>
        <span class="ruby-identifier">results</span>[<span class="ruby-identifier">name</span>] = <span class="ruby-identifier">entry</span>.<span class="ruby-identifier">value</span>
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">results</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- read_multi-source -->
          
        </div>

        

        
      </div><!-- read_multi-method -->

    
      <div id="method-i-silence-21" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">silence!</span><span
            class="method-args">()</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Silence the logger.</p>
          

          
          <div class="method-source-code" id="silence-21-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.7/lib/active_support/cache.rb, line 157</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">silence!</span>
  <span class="ruby-ivar">@silence</span> = <span class="ruby-keyword">true</span>
  <span class="ruby-keyword">self</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- silence-21-source -->
          
        </div>

        

        
      </div><!-- silence-21-method -->

    
      <div id="method-i-write" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">write</span><span
            class="method-args">(name, value, options = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Writes the value to the cache, with the key.</p>

<p>Options are passed to the underlying cache implementation.</p>
          

          
          <div class="method-source-code" id="write-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.7/lib/active_support/cache.rb, line 360</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">write</span>(<span class="ruby-identifier">name</span>, <span class="ruby-identifier">value</span>, <span class="ruby-identifier">options</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-identifier">options</span> = <span class="ruby-identifier">merged_options</span>(<span class="ruby-identifier">options</span>)
  <span class="ruby-identifier">instrument</span>(<span class="ruby-value">:write</span>, <span class="ruby-identifier">name</span>, <span class="ruby-identifier">options</span>) <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">payload</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">entry</span> = <span class="ruby-constant">Entry</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">value</span>, <span class="ruby-identifier">options</span>)
    <span class="ruby-identifier">write_entry</span>(<span class="ruby-identifier">namespaced_key</span>(<span class="ruby-identifier">name</span>, <span class="ruby-identifier">options</span>), <span class="ruby-identifier">entry</span>, <span class="ruby-identifier">options</span>)
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- write-source -->
          
        </div>

        

        
      </div><!-- write-method -->

    
    </section><!-- public-instance-method-details -->
  
     <section id="protected-instance-5Buntitled-5D-method-details" class="method-section section">
      <h3 class="section-header">Protected Instance Methods</h3>

    
      <div id="method-i-key_matcher" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">key_matcher</span><span
            class="method-args">(pattern, options)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Add the namespace defined in the options to a pattern designed to match
keys. Implementations that support <a
href="Store.html#method-i-delete_matched">#delete_matched</a> should call
this method to translate a pattern that matches names into one that matches
namespaced keys.</p>
          

          
          <div class="method-source-code" id="key_matcher-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.7/lib/active_support/cache.rb, line 443</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">key_matcher</span>(<span class="ruby-identifier">pattern</span>, <span class="ruby-identifier">options</span>)
  <span class="ruby-identifier">prefix</span> = <span class="ruby-identifier">options</span>[<span class="ruby-value">:namespace</span>].<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">Proc</span>) <span class="ruby-operator">?</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:namespace</span>].<span class="ruby-identifier">call</span> <span class="ruby-operator">:</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:namespace</span>]
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">prefix</span>
    <span class="ruby-identifier">source</span> = <span class="ruby-identifier">pattern</span>.<span class="ruby-identifier">source</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">source</span>.<span class="ruby-identifier">start_with?</span>(<span class="ruby-string">'^'</span>)
      <span class="ruby-identifier">source</span> = <span class="ruby-identifier">source</span>[<span class="ruby-value">1</span>, <span class="ruby-identifier">source</span>.<span class="ruby-identifier">length</span>]
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">source</span> = <span class="ruby-node">&quot;.*#{source[0, source.length]}&quot;</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-constant">Regexp</span>.<span class="ruby-identifier">new</span>(<span class="ruby-node">&quot;^#{Regexp.escape(prefix)}:#{source}&quot;</span>, <span class="ruby-identifier">pattern</span>.<span class="ruby-identifier">options</span>)
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">pattern</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- key_matcher-source -->
          
        </div>

        

        
      </div><!-- key_matcher-method -->

    
    </section><!-- protected-instance-method-details -->
  
  </section><!-- 5Buntitled-5D -->

</div><!-- documentation -->


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